FFmpeg: libavcodec/truemotion1.c Source File

00001 /*
00002  * Duck TrueMotion 1.0 Decoder
00003  * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00032 #include <stdio.h>
00033 #include <stdlib.h>
00034 #include <string.h>
00035 
00036 #include "avcodec.h"
00037 #include "dsputil.h"
00038 #include "libavutil/imgutils.h"
00039 #include "libavutil/internal.h"
00040 #include "libavutil/mem.h"
00041 
00042 #include "truemotion1data.h"
00043 
00044 typedef struct TrueMotion1Context {
00045     AVCodecContext *avctx;
00046     AVFrame frame;
00047 
00048     const uint8_t *buf;
00049     int size;
00050 
00051     const uint8_t *mb_change_bits;
00052     int mb_change_bits_row_size;
00053     const uint8_t *index_stream;
00054     int index_stream_size;
00055 
00056     int flags;
00057     int x, y, w, h;
00058 
00059     uint32_t y_predictor_table[1024];
00060     uint32_t c_predictor_table[1024];
00061     uint32_t fat_y_predictor_table[1024];
00062     uint32_t fat_c_predictor_table[1024];
00063 
00064     int compression;
00065     int block_type;
00066     int block_width;
00067     int block_height;
00068 
00069     int16_t ydt[8];
00070     int16_t cdt[8];
00071     int16_t fat_ydt[8];
00072     int16_t fat_cdt[8];
00073 
00074     int last_deltaset, last_vectable;
00075 
00076     unsigned int *vert_pred;
00077     int vert_pred_size;
00078 
00079 } TrueMotion1Context;
00080 
00081 #define FLAG_SPRITE         32
00082 #define FLAG_KEYFRAME       16
00083 #define FLAG_INTERFRAME      8
00084 #define FLAG_INTERPOLATED    4
00085 
00086 struct frame_header {
00087     uint8_t header_size;
00088     uint8_t compression;
00089     uint8_t deltaset;
00090     uint8_t vectable;
00091     uint16_t ysize;
00092     uint16_t xsize;
00093     uint16_t checksum;
00094     uint8_t version;
00095     uint8_t header_type;
00096     uint8_t flags;
00097     uint8_t control;
00098     uint16_t xoffset;
00099     uint16_t yoffset;
00100     uint16_t width;
00101     uint16_t height;
00102 };
00103 
00104 #define ALGO_NOP        0
00105 #define ALGO_RGB16V     1
00106 #define ALGO_RGB16H     2
00107 #define ALGO_RGB24H     3
00108 
00109 /* these are the various block sizes that can occupy a 4x4 block */
00110 #define BLOCK_2x2  0
00111 #define BLOCK_2x4  1
00112 #define BLOCK_4x2  2
00113 #define BLOCK_4x4  3
00114 
00115 typedef struct comp_types {
00116     int algorithm;
00117     int block_width; // vres
00118     int block_height; // hres
00119     int block_type;
00120 } comp_types;
00121 
00122 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
00123 static const comp_types compression_types[17] = {
00124     { ALGO_NOP,    0, 0, 0 },
00125 
00126     { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
00127     { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
00128     { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
00129     { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
00130 
00131     { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
00132     { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
00133     { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
00134     { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
00135 
00136     { ALGO_NOP,    4, 4, BLOCK_4x4 },
00137     { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
00138     { ALGO_NOP,    4, 2, BLOCK_4x2 },
00139     { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
00140 
00141     { ALGO_NOP,    2, 4, BLOCK_2x4 },
00142     { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
00143     { ALGO_NOP,    2, 2, BLOCK_2x2 },
00144     { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
00145 };
00146 
00147 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
00148 {
00149     int i;
00150 
00151     if (delta_table_index > 3)
00152         return;
00153 
00154     memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
00155     memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
00156     memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
00157     memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
00158 
00159     /* Y skinny deltas need to be halved for some reason; maybe the
00160      * skinny Y deltas should be modified */
00161     for (i = 0; i < 8; i++)
00162     {
00163         /* drop the lsb before dividing by 2-- net effect: round down
00164          * when dividing a negative number (e.g., -3/2 = -2, not -1) */
00165         s->ydt[i] &= 0xFFFE;
00166         s->ydt[i] /= 2;
00167     }
00168 }
00169 
00170 #if HAVE_BIGENDIAN
00171 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
00172 #else
00173 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
00174 #endif
00175 {
00176     int lo, hi;
00177 
00178     lo = ydt[p1];
00179     lo += (lo << 5) + (lo << 10);
00180     hi = ydt[p2];
00181     hi += (hi << 5) + (hi << 10);
00182     return (lo + (hi << 16)) << 1;
00183 }
00184 
00185 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
00186 {
00187     int r, b, lo;
00188 
00189     b = cdt[p2];
00190     r = cdt[p1] << 10;
00191     lo = b + r;
00192     return (lo + (lo << 16)) << 1;
00193 }
00194 
00195 #if HAVE_BIGENDIAN
00196 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
00197 #else
00198 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
00199 #endif
00200 {
00201     int lo, hi;
00202 
00203     lo = ydt[p1];
00204     lo += (lo << 6) + (lo << 11);
00205     hi = ydt[p2];
00206     hi += (hi << 6) + (hi << 11);
00207     return (lo + (hi << 16)) << 1;
00208 }
00209 
00210 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
00211 {
00212     int r, b, lo;
00213 
00214     b = cdt[p2];
00215     r = cdt[p1] << 11;
00216     lo = b + r;
00217     return (lo + (lo << 16)) << 1;
00218 }
00219 
00220 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
00221 {
00222     int lo, hi;
00223 
00224     lo = ydt[p1];
00225     hi = ydt[p2];
00226     return (lo + (hi << 8) + (hi << 16)) << 1;
00227 }
00228 
00229 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
00230 {
00231     int r, b;
00232 
00233     b = cdt[p2];
00234     r = cdt[p1]<<16;
00235     return (b+r) << 1;
00236 }
00237 
00238 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
00239 {
00240     int len, i, j;
00241     unsigned char delta_pair;
00242 
00243     for (i = 0; i < 1024; i += 4)
00244     {
00245         len = *sel_vector_table++ / 2;
00246         for (j = 0; j < len; j++)
00247         {
00248             delta_pair = *sel_vector_table++;
00249             s->y_predictor_table[i+j] = 0xfffffffe &
00250                 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
00251             s->c_predictor_table[i+j] = 0xfffffffe &
00252                 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
00253         }
00254         s->y_predictor_table[i+(j-1)] |= 1;
00255         s->c_predictor_table[i+(j-1)] |= 1;
00256     }
00257 }
00258 
00259 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
00260 {
00261     int len, i, j;
00262     unsigned char delta_pair;
00263 
00264     for (i = 0; i < 1024; i += 4)
00265     {
00266         len = *sel_vector_table++ / 2;
00267         for (j = 0; j < len; j++)
00268         {
00269             delta_pair = *sel_vector_table++;
00270             s->y_predictor_table[i+j] = 0xfffffffe &
00271                 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
00272             s->c_predictor_table[i+j] = 0xfffffffe &
00273                 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
00274         }
00275         s->y_predictor_table[i+(j-1)] |= 1;
00276         s->c_predictor_table[i+(j-1)] |= 1;
00277     }
00278 }
00279 
00280 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
00281 {
00282     int len, i, j;
00283     unsigned char delta_pair;
00284 
00285     for (i = 0; i < 1024; i += 4)
00286     {
00287         len = *sel_vector_table++ / 2;
00288         for (j = 0; j < len; j++)
00289         {
00290             delta_pair = *sel_vector_table++;
00291             s->y_predictor_table[i+j] = 0xfffffffe &
00292                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
00293             s->c_predictor_table[i+j] = 0xfffffffe &
00294                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
00295             s->fat_y_predictor_table[i+j] = 0xfffffffe &
00296                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
00297             s->fat_c_predictor_table[i+j] = 0xfffffffe &
00298                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
00299         }
00300         s->y_predictor_table[i+(j-1)] |= 1;
00301         s->c_predictor_table[i+(j-1)] |= 1;
00302         s->fat_y_predictor_table[i+(j-1)] |= 1;
00303         s->fat_c_predictor_table[i+(j-1)] |= 1;
00304     }
00305 }
00306 
00307 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
00308  * there was an error while decoding the header */
00309 static int truemotion1_decode_header(TrueMotion1Context *s)
00310 {
00311     int i;
00312     int width_shift = 0;
00313     int new_pix_fmt;
00314     struct frame_header header;
00315     uint8_t header_buffer[128] = { 0 };  /* logical maximum size of the header */
00316     const uint8_t *sel_vector_table;
00317 
00318     header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
00319     if (s->buf[0] < 0x10 || header.header_size >= s->size)
00320     {
00321         av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
00322         return -1;
00323     }
00324 
00325     /* unscramble the header bytes with a XOR operation */
00326     for (i = 1; i < header.header_size; i++)
00327         header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
00328 
00329     header.compression = header_buffer[0];
00330     header.deltaset = header_buffer[1];
00331     header.vectable = header_buffer[2];
00332     header.ysize = AV_RL16(&header_buffer[3]);
00333     header.xsize = AV_RL16(&header_buffer[5]);
00334     header.checksum = AV_RL16(&header_buffer[7]);
00335     header.version = header_buffer[9];
00336     header.header_type = header_buffer[10];
00337     header.flags = header_buffer[11];
00338     header.control = header_buffer[12];
00339 
00340     /* Version 2 */
00341     if (header.version >= 2)
00342     {
00343         if (header.header_type > 3)
00344         {
00345             av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
00346             return -1;
00347         } else if ((header.header_type == 2) || (header.header_type == 3)) {
00348             s->flags = header.flags;
00349             if (!(s->flags & FLAG_INTERFRAME))
00350                 s->flags |= FLAG_KEYFRAME;
00351         } else
00352             s->flags = FLAG_KEYFRAME;
00353     } else /* Version 1 */
00354         s->flags = FLAG_KEYFRAME;
00355 
00356     if (s->flags & FLAG_SPRITE) {
00357         av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n");
00358         /* FIXME header.width, height, xoffset and yoffset aren't initialized */
00359         return -1;
00360     } else {
00361         s->w = header.xsize;
00362         s->h = header.ysize;
00363         if (header.header_type < 2) {
00364             if ((s->w < 213) && (s->h >= 176))
00365             {
00366                 s->flags |= FLAG_INTERPOLATED;
00367                 av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n");
00368             }
00369         }
00370     }
00371 
00372     if (header.compression >= 17) {
00373         av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
00374         return -1;
00375     }
00376 
00377     if ((header.deltaset != s->last_deltaset) ||
00378         (header.vectable != s->last_vectable))
00379         select_delta_tables(s, header.deltaset);
00380 
00381     if ((header.compression & 1) && header.header_type)
00382         sel_vector_table = pc_tbl2;
00383     else {
00384         if (header.vectable > 0 && header.vectable < 4)
00385             sel_vector_table = tables[header.vectable - 1];
00386         else {
00387             av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
00388             return -1;
00389         }
00390     }
00391 
00392     if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
00393         new_pix_fmt = PIX_FMT_RGB32;
00394         width_shift = 1;
00395     } else
00396         new_pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
00397 
00398     s->w >>= width_shift;
00399     if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)
00400         return -1;
00401 
00402     if (s->w != s->avctx->width || s->h != s->avctx->height ||
00403         new_pix_fmt != s->avctx->pix_fmt) {
00404         if (s->frame.data[0])
00405             s->avctx->release_buffer(s->avctx, &s->frame);
00406         s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
00407         s->avctx->pix_fmt = new_pix_fmt;
00408         avcodec_set_dimensions(s->avctx, s->w, s->h);
00409         av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
00410     }
00411 
00412     /* There is 1 change bit per 4 pixels, so each change byte represents
00413      * 32 pixels; divide width by 4 to obtain the number of change bits and
00414      * then round up to the nearest byte. */
00415     s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
00416 
00417     if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
00418     {
00419         if (compression_types[header.compression].algorithm == ALGO_RGB24H)
00420             gen_vector_table24(s, sel_vector_table);
00421         else
00422         if (s->avctx->pix_fmt == PIX_FMT_RGB555)
00423             gen_vector_table15(s, sel_vector_table);
00424         else
00425             gen_vector_table16(s, sel_vector_table);
00426     }
00427 
00428     /* set up pointers to the other key data chunks */
00429     s->mb_change_bits = s->buf + header.header_size;
00430     if (s->flags & FLAG_KEYFRAME) {
00431         /* no change bits specified for a keyframe; only index bytes */
00432         s->index_stream = s->mb_change_bits;
00433     } else {
00434         /* one change bit per 4x4 block */
00435         s->index_stream = s->mb_change_bits +
00436             (s->mb_change_bits_row_size * (s->avctx->height >> 2));
00437     }
00438     s->index_stream_size = s->size - (s->index_stream - s->buf);
00439 
00440     s->last_deltaset = header.deltaset;
00441     s->last_vectable = header.vectable;
00442     s->compression = header.compression;
00443     s->block_width = compression_types[header.compression].block_width;
00444     s->block_height = compression_types[header.compression].block_height;
00445     s->block_type = compression_types[header.compression].block_type;
00446 
00447     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
00448         av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
00449             s->last_deltaset, s->last_vectable, s->compression, s->block_width,
00450             s->block_height, s->block_type,
00451             s->flags & FLAG_KEYFRAME ? " KEY" : "",
00452             s->flags & FLAG_INTERFRAME ? " INTER" : "",
00453             s->flags & FLAG_SPRITE ? " SPRITE" : "",
00454             s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
00455 
00456     return header.header_size;
00457 }
00458 
00459 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
00460 {
00461     TrueMotion1Context *s = avctx->priv_data;
00462 
00463     s->avctx = avctx;
00464 
00465     // FIXME: it may change ?
00466 //    if (avctx->bits_per_sample == 24)
00467 //        avctx->pix_fmt = PIX_FMT_RGB24;
00468 //    else
00469 //        avctx->pix_fmt = PIX_FMT_RGB555;
00470 
00471     avcodec_get_frame_defaults(&s->frame);
00472     s->frame.data[0] = NULL;
00473 
00474     /* there is a vertical predictor for each pixel in a line; each vertical
00475      * predictor is 0 to start with */
00476     av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
00477 
00478     return 0;
00479 }
00480 
00481 /*
00482 Block decoding order:
00483 
00484 dxi: Y-Y
00485 dxic: Y-C-Y
00486 dxic2: Y-C-Y-C
00487 
00488 hres,vres,i,i%vres (0 < i < 4)
00489 2x2 0: 0 dxic2
00490 2x2 1: 1 dxi
00491 2x2 2: 0 dxic2
00492 2x2 3: 1 dxi
00493 2x4 0: 0 dxic2
00494 2x4 1: 1 dxi
00495 2x4 2: 2 dxi
00496 2x4 3: 3 dxi
00497 4x2 0: 0 dxic
00498 4x2 1: 1 dxi
00499 4x2 2: 0 dxic
00500 4x2 3: 1 dxi
00501 4x4 0: 0 dxic
00502 4x4 1: 1 dxi
00503 4x4 2: 2 dxi
00504 4x4 3: 3 dxi
00505 */
00506 
00507 #define GET_NEXT_INDEX() \
00508 {\
00509     if (index_stream_index >= s->index_stream_size) { \
00510         av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
00511         return; \
00512     } \
00513     index = s->index_stream[index_stream_index++] * 4; \
00514 }
00515 
00516 #define APPLY_C_PREDICTOR() \
00517     if(index > 1023){\
00518         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00519         return; \
00520     }\
00521     predictor_pair = s->c_predictor_table[index]; \
00522     horiz_pred += (predictor_pair >> 1); \
00523     if (predictor_pair & 1) { \
00524         GET_NEXT_INDEX() \
00525         if (!index) { \
00526             GET_NEXT_INDEX() \
00527             predictor_pair = s->c_predictor_table[index]; \
00528             horiz_pred += ((predictor_pair >> 1) * 5); \
00529             if (predictor_pair & 1) \
00530                 GET_NEXT_INDEX() \
00531             else \
00532                 index++; \
00533         } \
00534     } else \
00535         index++;
00536 
00537 #define APPLY_C_PREDICTOR_24() \
00538     if(index > 1023){\
00539         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00540         return; \
00541     }\
00542     predictor_pair = s->c_predictor_table[index]; \
00543     horiz_pred += (predictor_pair >> 1); \
00544     if (predictor_pair & 1) { \
00545         GET_NEXT_INDEX() \
00546         if (!index) { \
00547             GET_NEXT_INDEX() \
00548             predictor_pair = s->fat_c_predictor_table[index]; \
00549             horiz_pred += (predictor_pair >> 1); \
00550             if (predictor_pair & 1) \
00551                 GET_NEXT_INDEX() \
00552             else \
00553                 index++; \
00554         } \
00555     } else \
00556         index++;
00557 
00558 
00559 #define APPLY_Y_PREDICTOR() \
00560     if(index > 1023){\
00561         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00562         return; \
00563     }\
00564     predictor_pair = s->y_predictor_table[index]; \
00565     horiz_pred += (predictor_pair >> 1); \
00566     if (predictor_pair & 1) { \
00567         GET_NEXT_INDEX() \
00568         if (!index) { \
00569             GET_NEXT_INDEX() \
00570             predictor_pair = s->y_predictor_table[index]; \
00571             horiz_pred += ((predictor_pair >> 1) * 5); \
00572             if (predictor_pair & 1) \
00573                 GET_NEXT_INDEX() \
00574             else \
00575                 index++; \
00576         } \
00577     } else \
00578         index++;
00579 
00580 #define APPLY_Y_PREDICTOR_24() \
00581     if(index > 1023){\
00582         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00583         return; \
00584     }\
00585     predictor_pair = s->y_predictor_table[index]; \
00586     horiz_pred += (predictor_pair >> 1); \
00587     if (predictor_pair & 1) { \
00588         GET_NEXT_INDEX() \
00589         if (!index) { \
00590             GET_NEXT_INDEX() \
00591             predictor_pair = s->fat_y_predictor_table[index]; \
00592             horiz_pred += (predictor_pair >> 1); \
00593             if (predictor_pair & 1) \
00594                 GET_NEXT_INDEX() \
00595             else \
00596                 index++; \
00597         } \
00598     } else \
00599         index++;
00600 
00601 #define OUTPUT_PIXEL_PAIR() \
00602     *current_pixel_pair = *vert_pred + horiz_pred; \
00603     *vert_pred++ = *current_pixel_pair++;
00604 
00605 static void truemotion1_decode_16bit(TrueMotion1Context *s)
00606 {
00607     int y;
00608     int pixels_left;  /* remaining pixels on this line */
00609     unsigned int predictor_pair;
00610     unsigned int horiz_pred;
00611     unsigned int *vert_pred;
00612     unsigned int *current_pixel_pair;
00613     unsigned char *current_line = s->frame.data[0];
00614     int keyframe = s->flags & FLAG_KEYFRAME;
00615 
00616     /* these variables are for managing the stream of macroblock change bits */
00617     const unsigned char *mb_change_bits = s->mb_change_bits;
00618     unsigned char mb_change_byte;
00619     unsigned char mb_change_byte_mask;
00620     int mb_change_index;
00621 
00622     /* these variables are for managing the main index stream */
00623     int index_stream_index = 0;  /* yes, the index into the index stream */
00624     int index;
00625 
00626     /* clean out the line buffer */
00627     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
00628 
00629     GET_NEXT_INDEX();
00630 
00631     for (y = 0; y < s->avctx->height; y++) {
00632 
00633         /* re-init variables for the next line iteration */
00634         horiz_pred = 0;
00635         current_pixel_pair = (unsigned int *)current_line;
00636         vert_pred = s->vert_pred;
00637         mb_change_index = 0;
00638         mb_change_byte = mb_change_bits[mb_change_index++];
00639         mb_change_byte_mask = 0x01;
00640         pixels_left = s->avctx->width;
00641 
00642         while (pixels_left > 0) {
00643 
00644             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
00645 
00646                 switch (y & 3) {
00647                 case 0:
00648                     /* if macroblock width is 2, apply C-Y-C-Y; else
00649                      * apply C-Y-Y */
00650                     if (s->block_width == 2) {
00651                         APPLY_C_PREDICTOR();
00652                         APPLY_Y_PREDICTOR();
00653                         OUTPUT_PIXEL_PAIR();
00654                         APPLY_C_PREDICTOR();
00655                         APPLY_Y_PREDICTOR();
00656                         OUTPUT_PIXEL_PAIR();
00657                     } else {
00658                         APPLY_C_PREDICTOR();
00659                         APPLY_Y_PREDICTOR();
00660                         OUTPUT_PIXEL_PAIR();
00661                         APPLY_Y_PREDICTOR();
00662                         OUTPUT_PIXEL_PAIR();
00663                     }
00664                     break;
00665 
00666                 case 1:
00667                 case 3:
00668                     /* always apply 2 Y predictors on these iterations */
00669                     APPLY_Y_PREDICTOR();
00670                     OUTPUT_PIXEL_PAIR();
00671                     APPLY_Y_PREDICTOR();
00672                     OUTPUT_PIXEL_PAIR();
00673                     break;
00674 
00675                 case 2:
00676                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
00677                      * depending on the macroblock type */
00678                     if (s->block_type == BLOCK_2x2) {
00679                         APPLY_C_PREDICTOR();
00680                         APPLY_Y_PREDICTOR();
00681                         OUTPUT_PIXEL_PAIR();
00682                         APPLY_C_PREDICTOR();
00683                         APPLY_Y_PREDICTOR();
00684                         OUTPUT_PIXEL_PAIR();
00685                     } else if (s->block_type == BLOCK_4x2) {
00686                         APPLY_C_PREDICTOR();
00687                         APPLY_Y_PREDICTOR();
00688                         OUTPUT_PIXEL_PAIR();
00689                         APPLY_Y_PREDICTOR();
00690                         OUTPUT_PIXEL_PAIR();
00691                     } else {
00692                         APPLY_Y_PREDICTOR();
00693                         OUTPUT_PIXEL_PAIR();
00694                         APPLY_Y_PREDICTOR();
00695                         OUTPUT_PIXEL_PAIR();
00696                     }
00697                     break;
00698                 }
00699 
00700             } else {
00701 
00702                 /* skip (copy) four pixels, but reassign the horizontal
00703                  * predictor */
00704                 *vert_pred++ = *current_pixel_pair++;
00705                 horiz_pred = *current_pixel_pair - *vert_pred;
00706                 *vert_pred++ = *current_pixel_pair++;
00707 
00708             }
00709 
00710             if (!keyframe) {
00711                 mb_change_byte_mask <<= 1;
00712 
00713                 /* next byte */
00714                 if (!mb_change_byte_mask) {
00715                     mb_change_byte = mb_change_bits[mb_change_index++];
00716                     mb_change_byte_mask = 0x01;
00717                 }
00718             }
00719 
00720             pixels_left -= 4;
00721         }
00722 
00723         /* next change row */
00724         if (((y + 1) & 3) == 0)
00725             mb_change_bits += s->mb_change_bits_row_size;
00726 
00727         current_line += s->frame.linesize[0];
00728     }
00729 }
00730 
00731 static void truemotion1_decode_24bit(TrueMotion1Context *s)
00732 {
00733     int y;
00734     int pixels_left;  /* remaining pixels on this line */
00735     unsigned int predictor_pair;
00736     unsigned int horiz_pred;
00737     unsigned int *vert_pred;
00738     unsigned int *current_pixel_pair;
00739     unsigned char *current_line = s->frame.data[0];
00740     int keyframe = s->flags & FLAG_KEYFRAME;
00741 
00742     /* these variables are for managing the stream of macroblock change bits */
00743     const unsigned char *mb_change_bits = s->mb_change_bits;
00744     unsigned char mb_change_byte;
00745     unsigned char mb_change_byte_mask;
00746     int mb_change_index;
00747 
00748     /* these variables are for managing the main index stream */
00749     int index_stream_index = 0;  /* yes, the index into the index stream */
00750     int index;
00751 
00752     /* clean out the line buffer */
00753     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
00754 
00755     GET_NEXT_INDEX();
00756 
00757     for (y = 0; y < s->avctx->height; y++) {
00758 
00759         /* re-init variables for the next line iteration */
00760         horiz_pred = 0;
00761         current_pixel_pair = (unsigned int *)current_line;
00762         vert_pred = s->vert_pred;
00763         mb_change_index = 0;
00764         mb_change_byte = mb_change_bits[mb_change_index++];
00765         mb_change_byte_mask = 0x01;
00766         pixels_left = s->avctx->width;
00767 
00768         while (pixels_left > 0) {
00769 
00770             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
00771 
00772                 switch (y & 3) {
00773                 case 0:
00774                     /* if macroblock width is 2, apply C-Y-C-Y; else
00775                      * apply C-Y-Y */
00776                     if (s->block_width == 2) {
00777                         APPLY_C_PREDICTOR_24();
00778                         APPLY_Y_PREDICTOR_24();
00779                         OUTPUT_PIXEL_PAIR();
00780                         APPLY_C_PREDICTOR_24();
00781                         APPLY_Y_PREDICTOR_24();
00782                         OUTPUT_PIXEL_PAIR();
00783                     } else {
00784                         APPLY_C_PREDICTOR_24();
00785                         APPLY_Y_PREDICTOR_24();
00786                         OUTPUT_PIXEL_PAIR();
00787                         APPLY_Y_PREDICTOR_24();
00788                         OUTPUT_PIXEL_PAIR();
00789                     }
00790                     break;
00791 
00792                 case 1:
00793                 case 3:
00794                     /* always apply 2 Y predictors on these iterations */
00795                     APPLY_Y_PREDICTOR_24();
00796                     OUTPUT_PIXEL_PAIR();
00797                     APPLY_Y_PREDICTOR_24();
00798                     OUTPUT_PIXEL_PAIR();
00799                     break;
00800 
00801                 case 2:
00802                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
00803                      * depending on the macroblock type */
00804                     if (s->block_type == BLOCK_2x2) {
00805                         APPLY_C_PREDICTOR_24();
00806                         APPLY_Y_PREDICTOR_24();
00807                         OUTPUT_PIXEL_PAIR();
00808                         APPLY_C_PREDICTOR_24();
00809                         APPLY_Y_PREDICTOR_24();
00810                         OUTPUT_PIXEL_PAIR();
00811                     } else if (s->block_type == BLOCK_4x2) {
00812                         APPLY_C_PREDICTOR_24();
00813                         APPLY_Y_PREDICTOR_24();
00814                         OUTPUT_PIXEL_PAIR();
00815                         APPLY_Y_PREDICTOR_24();
00816                         OUTPUT_PIXEL_PAIR();
00817                     } else {
00818                         APPLY_Y_PREDICTOR_24();
00819                         OUTPUT_PIXEL_PAIR();
00820                         APPLY_Y_PREDICTOR_24();
00821                         OUTPUT_PIXEL_PAIR();
00822                     }
00823                     break;
00824                 }
00825 
00826             } else {
00827 
00828                 /* skip (copy) four pixels, but reassign the horizontal
00829                  * predictor */
00830                 *vert_pred++ = *current_pixel_pair++;
00831                 horiz_pred = *current_pixel_pair - *vert_pred;
00832                 *vert_pred++ = *current_pixel_pair++;
00833 
00834             }
00835 
00836             if (!keyframe) {
00837                 mb_change_byte_mask <<= 1;
00838 
00839                 /* next byte */
00840                 if (!mb_change_byte_mask) {
00841                     mb_change_byte = mb_change_bits[mb_change_index++];
00842                     mb_change_byte_mask = 0x01;
00843                 }
00844             }
00845 
00846             pixels_left -= 2;
00847         }
00848 
00849         /* next change row */
00850         if (((y + 1) & 3) == 0)
00851             mb_change_bits += s->mb_change_bits_row_size;
00852 
00853         current_line += s->frame.linesize[0];
00854     }
00855 }
00856 
00857 
00858 static int truemotion1_decode_frame(AVCodecContext *avctx,
00859                                     void *data, int *data_size,
00860                                     AVPacket *avpkt)
00861 {
00862     const uint8_t *buf = avpkt->data;
00863     int buf_size = avpkt->size;
00864     TrueMotion1Context *s = avctx->priv_data;
00865 
00866     s->buf = buf;
00867     s->size = buf_size;
00868 
00869     if (truemotion1_decode_header(s) == -1)
00870         return -1;
00871 
00872     s->frame.reference = 3;
00873     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
00874         FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00875     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
00876         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00877         return -1;
00878     }
00879 
00880     if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
00881         truemotion1_decode_24bit(s);
00882     } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
00883         truemotion1_decode_16bit(s);
00884     }
00885 
00886     *data_size = sizeof(AVFrame);
00887     *(AVFrame*)data = s->frame;
00888 
00889     /* report that the buffer was completely consumed */
00890     return buf_size;
00891 }
00892 
00893 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
00894 {
00895     TrueMotion1Context *s = avctx->priv_data;
00896 
00897     if (s->frame.data[0])
00898         avctx->release_buffer(avctx, &s->frame);
00899 
00900     av_free(s->vert_pred);
00901 
00902     return 0;
00903 }
00904 
00905 AVCodec ff_truemotion1_decoder = {
00906     .name           = "truemotion1",
00907     .type           = AVMEDIA_TYPE_VIDEO,
00908     .id             = AV_CODEC_ID_TRUEMOTION1,
00909     .priv_data_size = sizeof(TrueMotion1Context),
00910     .init           = truemotion1_decode_init,
00911     .close          = truemotion1_decode_end,
00912     .decode         = truemotion1_decode_frame,
00913     .capabilities   = CODEC_CAP_DR1,
00914     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
00915 };